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**Jerrin** · 02-17-2012, 11:35 PM

My engine knocks whenever i open throttle sudddenly. Did anyone had this experience?

**ashwinprakas** · 02-18-2012, 12:45 AM

Originally posted by Jerrin View Post

My engine knocks whenever i open throttle sudddenly. Did anyone had this experience?

That's normal. Even with regular acceleration beyond 6k I've noticed some mild knocking. Only when there's knocking when riding at idle speeds you need to worry.

**psr** · 02-18-2012, 02:02 AM

Originally posted by Jerrin View Post

My engine knocks whenever i open throttle sudddenly. Did anyone had this experience?

Originally posted by ashwinprakas View Post

That's normal. Even with regular acceleration beyond 6k I've noticed some mild knocking. Only when there's knocking when riding at idle speeds you need to worry.

Never had this problem,in my ZMA, and it is not normal to have it....unless you are in 5th gear at 40 Kmph and you whack open the throttle....even injected engine will have it initially before the knock sensor does it's work.Beyond 4 K RPM there will be no knocking,in any gear.

**Vishakh** · 02-18-2012, 09:54 AM

First of all hats off PSR sir

. That emulsion tube drilling is quite a thoughtful mod. And the engine knocking when whack opening the throttle has happened to me also. But I did it on standstill. Will have to check it above 4k rpm like you said.

OT

Guys remember that day I said my acc cable broke and I had to take my car for the journey?. Seems like god has done the work I had a small crash on car on monday. That too with a KSRTC bus. Lucky that I was in car. If the cable hadn't broke on the same position I would have been on bike . And it might have been worse. The bus damaged the right door and right mirror broke and went under the front tyre of bus and front right was also damaged. Will get car today after repairs. No personal injuries to anyone. Thanks to seat belts. Had an embarrassing moment in front of GF but traffic cops were friendly with me and quite helpful

**blACk_pANthER** · 02-18-2012, 10:02 AM

Originally posted by Jerrin View Post

My engine knocks whenever i open throttle sudddenly. Did anyone had this experience?

i get the small knocking only just after coldstarts & when i suddenly accelerate... but its gone with 10metres of riding...
or as psr sir said, might be because of wrong gearshifts...
knocking can also happen when there is sudden demand for fuel & ur carb is not able to supply enough... check fuel lines, carb & afr...
can you more specifically tell about the "knocking" sound... is it like the sound when the bike knocks & goes off or is it just a sudden increase in engine sound with wierd knocking... do you seem to loose power in this situation...

**psr** · 02-18-2012, 01:06 PM

Originally posted by Vishakh View Post

First of all hats off PSR sir

. That emulsion tube drilling is quite a thoughtful mod. And the engine knocking when whack opening the throttle has happened to me also. But I did it on standstill. Will have to check it above 4k rpm like you said.

OT

Guys remember that day I said my acc cable broke and I had to take my car for the journey?. Seems like god has done the work I had a small crash on car on monday. That too with a KSRTC bus. Lucky that I was in car. If the cable hadn't broke on the same position I would have been on bike . And it might have been worse. The bus damaged the right door and right mirror broke and went under the front tyre of bus and front right was also damaged. Will get car today after repairs. No personal injuries to anyone. Thanks to seat belts. Had an embarrassing moment in front of GF but traffic cops were friendly with me and quite helpful

The emulsion tube mod is from my grandfather's days

...so nothing new.The best part is ,if you don't like the mod or want to change the hole to lesser size, all you have to do is to solder the hole shut and either leave it stock,or drill it to the size you desire. yesterday I had done this and had reduced the hole size to 0.5..............
what a providential escape you had

God intervenes and save us many times without our knowing...
GOD luck to you and the family.

Originally posted by blACk_pANthER View Post

i get the small knocking only just after coldstarts & when i suddenly accelerate... but its gone with 10metres of riding...
or as psr sir said, might be because of wrong gearshifts...
knocking can also happen when there is sudden demand for fuel & ur carb is not able to supply enough... check fuel lines, carb & afr...
can you more specifically tell about the "knocking" sound... is it like the sound when the bike knocks & goes off or is it just a sudden increase in engine sound with wierd knocking... do you seem to loose power in this situation...

My carburetor, slide is polished,has additional vacuum hole in the slide,the return spring had been made softer for faster response, the throttle needle is raised,the emulsion tube is drilled,and AFR is at 3.5 turns. ..so I guess I cannot compare my bike's performance and behavior with any of the member's un modified ZMA.

**Vishakh** · 02-18-2012, 02:09 PM

Went to SVC today. Replaced acc cable B. Luckily I had the cable with me they didn't have it in stock ( as expected

). Charged me 30rs as labour.

And other finding. The SVC people test drove and said that the fork is loose and have to rectify it. And that is causing the TACK sound when slamming the disc brakes. They said they have to completely strip the fork set and reassemble it.

**SriramEfunds** · 02-18-2012, 02:13 PM

Originally posted by Vishakh View Post

Went to SVC today. Replaced acc cable B. Luckily I had the cable with me they didn't have it in stock ( as expected

). Charged me 30rs as labour.

And other finding. The SVC people test drove and said that the fork is loose and have to rectify it. And that is causing the TACK sound when slamming the disc brakes. They said they have to completely strip the fork set and reassemble it.

Check with them, I'm afraid that we might have to change the cone set (Racer ball kit).

**Vishakh** · 02-18-2012, 02:27 PM

Originally posted by SriramEfunds View Post

Check with them, I'm afraid that we might have to change the cone set (Racer ball kit).

So you also got the same problem?.

. Will take it to SVC on wednesday.

**punarvasu** · 02-18-2012, 02:42 PM

Originally posted by psr View Post

God intervenes and save us many times without our knowing.

Excuse me, PSRji. Where was he at the time of the crusades, inquisitions, including this one and those going on in some states of our country, world wars, and the tsunamis? Sleeping?

**Ramborider** · 02-18-2012, 04:10 PM

Hii to all,i had chnged my zma tire to M45,but tire touch to mud guard at left side,tire size is 4.00 R18,and i had noticed mudguard is slightly oriented to right side,and i removed chain cover

which i dont want to remove.

**Aneesh@4GHz** · 02-18-2012, 04:27 PM

Originally posted by punarvasu View Post

Excuse me, PSRji. Where was he at the time of the crusades, inquisitions, including this one and those going on in some states of our country, world wars, and the tsunamis? Sleeping?

Originally posted by Ramborider View Post

Hii to all,i had chnged my zma tire to M45,but tire touch to mud guard at left side,tire size is 4.00 R18,and i had noticed mudguard is slightly oriented to right side,and i removed chain cover

which i dont want to remove.

Alignment problem,check alignment and make sure both sides are correct.

**psr** · 02-18-2012, 04:47 PM

Originally posted by punarvasu View Post

Excuse me, PSRji. Where was he at the time of the crusades, inquisitions, including this one and those going on in some states of our country, world wars, and the tsunamis? Sleeping?
The victims including infants of 2004 tsunami were at least 3’00’000.

The day before Tsunami hit our coast I was at the sea shore and did notice that the Sea had retreated Far inside..I did notice it and mentioned it to my family,and friends...the next day morning the Tsunami hit our coast...Why did it not happen the previous day ?.I had crashed with only a Helmet many times at 70 to 90 Kmph and survived,without even a fracture..
Me and my family supported 150 + families ,affected by Tsunami,for the first four days after Tsunami with food and clothe to wear till organized help arrived....and we still continue to support and help the Aged ,and destitutes,as also the children Orphaned and abused .

We complain about many things in life without realizing the gift of life,including fully functional body and mind which had been bestowed upon us.

Look around and you will understand in time.

**ashwinprakas** · 02-18-2012, 05:10 PM

Originally posted by psr View Post

unless you are in 5th gear at 40 Kmph and you whack open the throttle

Yup sir, I get what you mean, but we're not experiencing the above type of knocking. The above type of knocking is real bold and makes the bike vibe like hell. The knocking we're reffering to is the Drilling/Pistonning kinda engine noise we get when we rev past 6k, its there on all the ZMA's I've ridden and even R15's(6k),FZ's(7k) etc, though its hard to notice, only after constantly varying from 4~6K and above, RPM's you'll notice that there's a change in engine note after 6k.

Its also noticed when suddenly ripping the bike, I hope you remember me asking this question a while back, both you and Sriram sir had answered it by saying that it was normal and every bike running on CV Carb's should be revved smoothly, else the same will repeat due to the AFR becoming lean when sudden acceleration is given.

And OT.

A page from the CRF230F Instruction manual,regarding pinging.

**psr** · 02-18-2012, 06:46 PM

Originally posted by ashwinprakas View Post

Yup sir, I get what you mean, but we're not experiencing the above type of knocking. The above type of knocking is real bold and makes the bike vibe like hell. The knocking we're reffering to is the Drilling/Pistonning kinda engine noise we get when we rev past 6k, its there on all the ZMA's I've ridden and even R15's(6k),FZ's(7k) etc, though its hard to notice, only after constantly varying from 4~6K and above, RPM's you'll notice that there's a change in engine note after 6k.

Its also noticed when suddenly ripping the bike, I hope you remember me asking this question a while back, both you and Sriram sir had answered it by saying that it was normal and every bike running on CV Carb's should be revved smoothly, else the same will repeat due to the AFR becoming lean when sudden acceleration is given.
.

Poor quality of Gasoline,both in respect of Octane and contamination will cause problem...almost everyday I ride 40 Kms and do rev up to 6 K RPM from 4 K RPM,with/without pillion and not once I had faced the problem of knocking...
Please check for any air leaks or blockage of jets due to debris in petrol...check also for proper TPS working ...the TPS connector has 3 wires. Measure the center wire voltage with a Digital multimeter.With the ignition switched turned on,(without starting the engine) at minimum throttle it should read 0.5 volts,and as you twist the throttle should increase linearly to 4.3 Volts WOT.

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